JPH0527253Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a method for casting aluminum wheels for automobiles by die casting or low-pressure casting. The present invention relates to a burr punching device that removes burrs formed between the mating surfaces of molds and molds.

(Prior Art) When the mold is new, the distance between the upper and lower mold mating surfaces is small, so the burr is thin and spreads small. However, as the number of castings increases, aluminum tends to adhere to the mold, and when this is removed with a grinder, whetstone, etc., the mold is also polished, and the gap between the mating surfaces of the upper and lower molds gradually increases. So,
The thickness and amount of burrs increases. Measures have been taken to reduce the adhesion of aluminum by subjecting the mold to various surface treatments, but the effect of preventing or reducing the occurrence of burrs is not sufficient.

Traditionally, three methods have been used to remove burrs from cast aluminum wheels: (i) manual finishing, (ii) full-form press punching, and () articulated robots.
When these are evaluated as excellent, good, fair, or poor in terms of (a) productivity, (b) deburring cost, (e) quality (workmanship), and (d) versatility, the advantages and disadvantages are as follows.

(i) Hand finished: (a) Fair, (b) Good, (c) Fair, (d) Excellent.

(ii) General press punching: (a) Good, (b) Good, (c) Good, (d) Poor.

(iii) Articulated robot: (a), (b), (c), and (d).

(Problems to be Solved by the Invention) Of the three means of the prior art, (ii) full-form press punching involves manufacturing a trimming mold on a crank press or hydraulic press that matches the shape of all the window holes of the work wheel. The machine is mounted on the machine and operated perpendicular to the front surface of the work wheel to punch out burrs from all window holes at the same time, so excellent results can be expected in terms of (a) productivity and (b) deburring costs. .

And a work wheel A as shown in Fig. 4 A.
is a simple type with one type of window hole B, and since the burr c is perpendicular to the punching direction p as shown in FIG. However, the work wheel D as shown in Figure 5 A and B has two types of slightly irregularly shaped window holes E and F, and the vertical surface of the burr c has a small angle in the punching direction as shown in Figure 5 C. There are the following problems in cases where C′ occurs.

(b) If the window hole is tilted, the vertical side of the burr
The C′ area tends to be crushed and the finish is likely to be defective.

(b) It is necessary to manufacture a complete trimming mold for each type of work wheel, which increases costs.
Wheels are products that require emphasis on their design effect, so they are produced in a wide variety of small quantities in small quantities, and creating a complete and expensive trimming mold for each small number of products increases deburring costs.

This invention is different from conventional general press punching.
Deburring wheels that can be applied as shown in Figure 4 has high productivity and low deburring costs, but wheels as shown in Figure 5 have defects that make it difficult or impossible to apply and lack versatility. It is an object of the present invention to provide a burr punching device that provides a compatible solution to this negative aspect.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, instead of punching out the burrs in all the window holes of the wheel at the same time, the burrs are punched out for each individual window hole one after another. To enable hydraulic press punching. Therefore, the work wheel is attached to the wheel mounting table at the center of the base, and at this time, the front surface of the wheel is used as the upper surface, the reference surface, and the table is indexed and rotated at the arrangement angle pitch of the window hole. and,
For window holes of the same shape, each burr punching table is placed at a position around the table on the base, and the punch on the burr punching table is adjusted to change the position of the three-dimensional degree of freedom and to change the angle of freedom in two or more axes. Adjust the angle so that the punch directly faces each window hole and the punching direction is perpendicular to the burr of the window hole.

In other words, the burr punching device of the present invention has a wheel mounting table whose index rotates at the center of the base, one or more burr punching tables are arranged around it, and the front surface is placed on the wheel mounting table. On each burr punching table, the burr punch is oriented perpendicularly to the window hole of the work wheel, which is mounted facing upward, and the punch is operated by hydraulic punching. It is characterized by being mounted on a base via a mechanism that allows freedom of movement.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The burr punching device of the present invention will be specifically described below based on embodiments with reference to FIGS. 1 to 3. 1st
The figure shows a partially cutaway front view of the apparatus according to the present invention, and FIG. 2 shows a side view of the central wheel mounting table.

A wheel-mounted table 2 with a vertical axis is installed at the center position on the base 1, and is connected to an indexing device 3 with NC so that indexing and rotation can be performed around the vertical axis. At positions around the table 2 on the base 1, there is a work wheel D illustrated in FIG.
For each, one burr punching table 4 is arranged corresponding to two types of window holes E and F having different shapes. Normally, two types of decorative window holes for one wheel are necessary and sufficient, but if three or more types are used, the number of burr punching tables can be adjusted accordingly.

The work wheel D is mounted on the wheel mounting table 2 with its front surface D1 facing upward for reasons to be described later.
be placed on top. Above it, a rotatable centering jig 5 is provided so as to be movable up and down along the support column 6 behind the wheel table 2, and is pushed onto the work wheel D by a centering jig up/down device 7 for centering and clamping. It's getting old. In this regard, in terms of casting technology, the wheel is cast in a casting cavity between an upper mold u, a lower mold v, and a horizontal mold s of a casting mold as shown in FIG.
The window holes E and F are also formed by the lower die v, and the burrs c and c' are formed on the wheel rear surface side of the upper die u. And the upper mold u is maximum 0.3 with respect to the lower mold v
There is a positional deviation of about mm. Therefore, the structure of the burr punching device is simpler if the positioning is performed using the unevenness of the rear surface of the workpiece, but due to the importance of ensuring accuracy, the front surface D1 is used as the burr punching surface and the centering reference surface. The tapered jig 5 is fitted using the unevenness of the front surface of the workpiece to regulate the x-, y-direction and angular position of the workpiece.

On the other hand, on the side of the burr punching table 4, burr punches 8 corresponding to the respective window holes E and F are mounted on a punching head 10 so as to be operated generally downward by a punching hydraulic cylinder 9. A displacement/angle mechanism with five degrees of freedom is provided between the punching head 10 and the base 1. That is,
Sequentially from the bottom: a screw-type moving mechanism section I that moves horizontally in a radial direction with respect to the center of the base by means of a handle 11, a screw-type moving mechanism section I that moves horizontally in a tangential direction by a handle 13 above it, and an upper part thereof. A worm gear type angular displacement mechanism part that is angularly displaced around the central axis x by a handle 13 of the worm gear type, a screw type movement mechanism part that moves up and down along a slightly inclined guide by a handle 14 on its inner side, and its inner side. A worm gear-type angular displacement mechanism is interposed, which is angularly displaced about the tangential axis y by the handle 15 of the camshaft. If necessary, a tilting mechanism around the vertical axis may be added. The selection of the operating mechanisms and the order of arrangement of these 5 to 6 mechanism parts are free in the present invention.
Any material may be used as long as it provides dimensional displacement freedom and two-axis or more angular freedom. 16 is a cylinder for moving the workpiece.

The device of the present invention having the above configuration is operated as follows to perform the burr punching operation.

As described above, the work wheel D is set on the wheel mounting table 2 with the front surface D1 facing upward, centered by the centering jig 5, and then clamped. Adjust the 5 degrees of freedom on the burr punching table 4 to move the burr punch 8 to a position directly facing one of the nearest window holes, and take an angular posture in which it faces directly.
The hydraulic cylinder 9 is operated in a direction perpendicular to the window surface of the window hole to punch out the burr. When the burr punching for one window of the same shape is completed, the work wheel is indexed and rotated one window pitch at a time by the indexing device 3 in conjunction with this, and the burr punching of window holes of the same shape is continued one after another. For a work wheel having two types of window holes, two burr punching tables 4 can be adjusted and punched out at the same time. When all the window burrs on one work wheel have been punched out in this way, the work wheel is unclamped and a new work wheel is set. For the second and subsequent work wheels of the same type, there is no need to readjust the burr punching table 4 by pressing the start button.
A series of punching operations, including clamping, punching, and unclamping, are automatically performed in the order in which the clamping, punching operations, and index rotation are linked.

(Effects of the Invention) According to the device of the present invention, the burr in the window hole of the work wheel can be punched out in a direction perpendicular to the surface where the burr is generated, so that the finish of the window hole is good. Accuracy is high because all the window holes are sequentially punched using accurate centering and angular positioning using the front surface of the work wheel and accurate pitch feed using the NC index. Furthermore, it is possible to perform burr punching for window holes of all shapes, just like a robot. Therefore, compared to the conventional press punching method, it is only necessary to manufacture a punch for one window hole of the same shape or two holes for different shapes, and a punch that is 1/10 to 1/20 of the total size trimming die is required. It has excellent versatility and can be applied to many types of wheels.

Compared to manual finishing in the prior art, the productivity of the burr punching operation is 2 to 5 times higher, and various effects such as a uniform and clean burr-removed surface can be obtained.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the burr punching device according to the embodiment of the present invention, Fig. 2 is a side view of the wheel mounting table in the center, Fig. 3 is a vertical sectional view of the wheel casting mold, and Fig. 4 A front view of an example of a wheel,
Figure 4B is a front view showing the occurrence of burrs on the window hole, Figure 4C is a cross-sectional view, Figure 5A is a front view of another example of the wheel, and Figure 5B is the occurrence of burrs on the window hole. A front view showing the situation, and FIG. 5C is a sectional view thereof. 1...Base, 2...Wheel mounting table,
3... Index device, 4... Burr punching table,
5... Centering jig, 6... Support, 7... Centering jig up/down device, 8... Burr punch, 9... Hydraulic cylinder for punching, 10... Punching head, 1
1, 12, 13, 14, 15...handle, 16
...Cylinder for work movement, I,... Displacement mechanism section, ... Angle mechanism section, x... Axis in the center direction, y... Axis in the connection direction, A, D... Work wheel, D1... Front Surface, B, E, F...window hole, C...burr, C'...vertical surface, u...upper mold, v
...lower type, s...horizontal type.

Claims (1)

[Claims for Utility Model Registration] (1) A wheel mounting table with index rotation is provided at the center of the base, one or more burr punching tables are arranged around it, and a centering standard for mounting the work wheel on the table is provided. The front side of the burr punching side is the front side, and the burr punches on each burr punching table are oriented at right angles to the window holes of the work wheel, which is mounted on the wheel mounting table with the front side facing upward, and the burr punches are operated hydraulically. A burr punching device characterized in that a punch is mounted on a base via a mechanism with two or more axes of freedom in angular variation and freedom in plane movement and vertical movement on the table. (2) The burr punching device according to claim 1, which is a utility model, wherein a work wheel and a centering jig are integrated, and the work wheel is index-rotated in conjunction with the operation of a burr punch.